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  1. #1
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    diode noise generator

    How to build a simple white noise generator ?

    i want to build a simple one ,so i can understand the white noise thoroughly.

    any suggestions or circuitry?

    thanks

    •   Alt25th March 2008, 10:15

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    zener noise generator

    every circuit is noisy, isnt it?
    so u can have it :P

    Hey u can have a pn sequence generator and its output will be a white noise genertor depending on ur bandwidth of interest u can use it.

    another is in dds, we get a signal and lots of spur, elliminate this main signal, and amplify rest



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    build white noise generator

    en~~~

    i see many circuitry use the zener diode as the white noise source~~~~~



    •   Alt25th March 2008, 13:49

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  4. #4
    FvM
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    simple white noise generator

    PN generator is a usual method, National previously had a MOS IC with PN generator to generate white noise for audio applications. Another usual method is by amplifying the voltage of a zener diode, it is band limited due to Cd || Rd time constant, but sufficient white for audio band. I don't have my old design folder at hand, thus I can't give you a circuit with component dimensions.



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    white noise diode

    Besides the idea of FvM to use the thermal noise obtained from a PN junction (and amplifying it), you should see this pseudo white noise generator using a PIC microcontroller:

    http://chip.aeug.org/noise508.asm



  6. #6
    FvM
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    white noise zener

    Yes, from part count aspect, a 8 pin micro is actually unrivaled. The point is that I didn't design a noise generator since 25 years...

    B.T.W.: Zener diode noise isn't thermal noise, it's shot noise amplified by avalanche effect.



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    white noise generator ic




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    how to make a white noise generator

    A Psedue Noise genarator in one of the simplest ways.



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